JPH06342184A - Display device for camera - Google Patents

Abstract

PURPOSE:To provide a display device for a camera capable of intuitively recognizing a difference between a set value and a detection value, or a calculation value as to a photographic condition. CONSTITUTION:A distance display part 30 for displaying distance information by the position of a rotated pointer 31 and a diaphragm display part 40 for displaying diaphragm information by the position of the rotated pointer 41 are mounted on the upper surface of the camera. A flash light attainable distance of a flashing device corresponding to the set stop value is calculated based on an stop value set by a photographer and the guide number of the flashing device, and also, a flash light attainable stop value corresponding to an object distance is calculated based on the object distance detected by a range finding sensor for the camera and the guide number of the flashing device. When the object distance exceeds the flash light attainable distance, the pointer 31 is rotated backward and forward in between the flash light attainable distance and the object distance, and also, the pointer 41 is rotated backward and forward in between the set stop value and the flash light attainable aperture value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying photographing information such as subject distance and aperture value.

[0002]

2. Description of the Related Art As a display device of this type, a warning is issued when the flash reach distance calculated from the set value of the camera aperture and the guide number of the flash device is less than the subject distance detected by the distance measuring sensor of the camera. Some illuminate the lamp to inform you of insufficient exposure. Also, for cameras that allow the photographer to manually set the shooting distance, the set shooting distance is compared with the subject distance detected by the camera, and the lighting state of the focusing lamp is switched according to the difference between them to focus on the subject. There is something to inform.

[0003]

In the camera described above,
Since the difference between the subject distance and the flash reach distance and the difference between the set value of the shooting distance and the actual subject distance are unknown, the correction amount cannot be immediately grasped even if a warning is given, and quick response is impossible. is there.

It is an object of the present invention to provide a display device for a camera that allows intuitive understanding of differences between set values, detected values, and calculated values related to shooting conditions.

[0005]

1 and 4, which show an embodiment, the present invention will be described. In the present invention, display means 30 and 40 capable of analog-displaying information relating to specific photographing conditions of a camera are provided. The sensor 53 and the set value input by the photographer in relation to the information to be displayed by the display units 30 and 40.
When any two values out of the three values of the detection value detected by and the calculation value calculated by the calculation means 50 are present at the same time, the display control means for alternately displaying these two values by the display means 30, 40. And 50 to achieve the above-mentioned object.

The information to be displayed on the display means 30, 40 may be distance information, aperture information or shutter speed information. When the distance information is to be displayed, the display means 30
The two values that are displayed alternately in
3 is the object distance detected, the flash reach distance corresponding to the aperture value of the flash device 54 calculated by the calculation unit 50, or the shooting distance set by the photographer and the object distance detected by the sensor 53. When the aperture information is to be displayed, the display means 4
The two values that are alternately displayed as 0 are, for example, an aperture value set by the photographer and an appropriate aperture value corresponding to the subject distance when using the flash device calculated by the calculation means 50, or an aperture value set by the photographer. And an appropriate aperture value calculated by the calculation means 50 based on the photometry result of the object scene. When the shutter speed is the display target, the display means alternately displays the shutter speed. 2
The two values include, for example, a shutter speed set by the photographer and an appropriate shutter speed calculated by the calculation means based on the result of photometry of the field.

The display means may be provided in two or more types, such as a distance display means 30 for displaying distance information and a diaphragm display means 40 for displaying diaphragm information. The subject distance detected by the sensor 53 by the distance display means 30 and the flash reaching distance corresponding to the aperture value of the flash device 54 calculated by the calculation means 50 are alternately displayed, and the aperture display means 40 sets the aperture value set by the photographer. And calculation means 50
When alternately displaying the proper aperture value corresponding to the subject distance when using the flash device calculated by, the distance display means and the aperture display means are arranged so that the display of the subject distance and the display of the proper aperture value are synchronized. It is preferable to provide the display cycle control means 50 for controlling the display switching cycle.

[0008]

With respect to the information to be displayed by the display means 30 and 40, any one of the three values of the set value input by the photographer, the detected value detected by the sensor 53, and the calculated value calculated by the calculating means 50 is used. When the two values are present at the same time, these two values are alternately displayed in analog form by the display means 30 and 40.

Incidentally, in the section of means and action for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 2 is a top view of a camera to which the display device of this embodiment is applied. In the figure, 1 is a camera body, 2
Is a taking lens barrel, and 3 is a release button. Reference numeral 4 denotes a mode selection dial for selecting the exposure control mode of the camera, which is rotatable around the release button 3. Set the index 4a of the mode selection dial 4 to the index "OF" on the camera body 1 side.
When set to "F", various camera operations are stopped. When the index 4a is aligned with the index "P", the camera determines both the shutter speed and the aperture value, and when the index "A" is aligned, the camera determines the shutter speed corresponding to the aperture setting value. The exposure is controlled in the aperture priority mode, and when the index "T" is met, the time mode in which exposure can be performed for an arbitrary time is performed. A command dial 5 generates a pulse signal according to the rotation. Reference numeral 6 is an AF mode button, and 7 is a correction mode button. These functions will be described later.

Reference numeral 8 is a pointer-type display for displaying various kinds of photographing information. As shown in FIG. 3, the display unit 8 includes a counter display unit 10 that displays the number of film frames, an exposure correction amount display unit 20 that displays the exposure correction amount, and a distance display unit 30 that displays the distance information. , And a diaphragm display section 40 for displaying diaphragm information. The counter display unit 10 has a pointer 11 that is rotationally driven according to the number of filmed frames of the film, and an index 12 that is arranged along the rotation path of the pointer 11 and is partially attached with a numerical value indicating the number of framed frames. . The figure shows the number of frames taken
The state at the time of 1 "is shown.

The exposure correction amount display section 20 has a pointer 21 and an index 22 arranged along the rotation path of the pointer 21 and provided with a numerical value indicating the exposure correction amount. When the command dial 5 is rotated while pressing the correction mode button 7, the exposure correction amount changes between −2 steps to +2 steps according to the rotation direction and the rotation amount, and the pointer 21 changes the set exposure correction amount. Rotate to the position shown. The figure shows a state in which the exposure correction amount is set to "0".

The distance display unit 30 has a pointer 31 which is driven to rotate according to the distance information to be displayed, and an index 32 which is arranged along the rotation path of the pointer 31. The index 32 is
A number indicating the distance in meters is attached to the outside, and a number indicating the distance in feet is attached to the inside. The character index “AF” is attached to one end of the index 32. The operation of the pointer 31 changes according to the focus mode selected by the AF mode button 6 (see FIG. 2).

When the command dial 5 is rotated while pressing the AF mode button 6, a manual focus mode (hereinafter referred to as an MF mode) in which the photographer can arbitrarily set the shooting distance is selected, and the rotation direction of the command dial 5 is selected. And the set value of the shooting distance changes according to the rotation amount.
At this time, the pointer 31 rotates to a position indicating the set shooting distance. When the AF mode button 6 is pressed again from the MF mode, the photographing lens is automatically driven to the in-focus position according to the object distance detected by the distance measuring sensor of the camera. .) Is selected, and at this time, the pointer 31 moves onto the character index “AF” as illustrated. When a half-press switch, which will be described later, is turned on while the AF mode is selected, the pointer 31 is rotationally driven to display the subject distance R. The operation in the AF mode will be described later in detail.

The aperture display section 40 has a pointer 41 which is driven to rotate according to the aperture value of the camera, and an index 42 which is arranged along the rotation path of the pointer 41 and is provided with a numerical value indicating the aperture value. The character index “P” is attached to one end of the index 42. When the aperture priority mode is selected with the mode selection dial 4 and the command dial 5 is rotated, the aperture setting value changes according to the direction and amount of rotation.
The pointer 41 rotates to a position that indicates the set aperture value. When the program exposure mode is selected by the mode selection dial 4 (see FIG. 2), the pointer 41 moves above the character index “P”. The figure shows that the aperture value is "F" in aperture priority mode.
The state is set to 4 ".

The above-mentioned pointers 11, 21, 31, 41 are driven by a stepping motor (not shown). The rotation of these stepping motors is controlled by the control system of the camera shown in FIG. In FIG. 4, reference numeral 50 denotes a control device composed of a microcomputer and its peripheral parts, which performs sequence control of the camera and various calculations, and executes a control program described later to display 8
Drive control.

The control device 50 is connected to the mode selection dial 4, the command dial 5, the AF mode button 6, the correction mode button 7 and the display 8 described above, and detects the focal length of a photographing lens (not shown). A focal length detection device 51, a lens driving device 52 that drives a photographing lens according to a command signal from the control device 50, a distance measuring device 53 that detects a subject distance, and a flash device that illuminates a subject according to a command signal from the control device 50. 54, a clock 55 that outputs information about the date and time is connected.

Further, the control device 50 includes a film feeding device 56 for winding and rewinding the film, a photographing frame number counting device 57 for counting the number of photographed frames, and the above-mentioned release button 3 (see FIG. 2). A half-press switch 58 that is turned on by a half-press operation, a release switch 59 that is turned on by a full-press operation of the release button 3, an exposure device 60 that drives a camera diaphragm and a shutter to expose a film, and the current shooting conditions are stored. Memory 61 and power-on completion detection switch 6
2 are connected. The power-on completion detection switch 62
Detects the presence / absence of the power supply battery of the camera, and is turned off when the lid (not shown) of the battery chamber is closed.

The control device 50 controls the rotation of the pointer 11 of the counter display portion 10 based on the number of imaged frames counted by the imaged frame number counting device 57, and the exposure set by the command dial 5 and the correction mode button 7. The rotation of the pointer 21 of the exposure correction amount display section 20 is controlled based on the correction amount. When the AF mode and the aperture priority mode are selected at the same time, the distance display unit 30 and the aperture display unit 40 are controlled according to the display processing procedure shown in FIGS.

When the half-push switch 58 is turned on with the AF mode and the aperture priority mode selected, the controller 5
0 starts the display process of FIGS. First, step S
In 1, the pointer 31 of the distance display unit 30 is rotationally driven to a position where the subject distance R detected by the distance measuring device 53 is displayed. In the next step S2, based on the aperture setting value stored in the memory 61 and the guide number of the flash device corresponding to the film sensitivity attached to the camera, the flash of the flash device 54 corresponding to the aperture setting value F is flashed. The reach distance D is calculated. In a succeeding step S3, based on the guide number of the flash device and the subject distance R detected by the distance measuring device 53, a minimum aperture value (hereinafter, a flash reachable aperture value) which becomes a limit for reaching the subject distance R Calculate E.

In step S4, it is determined whether or not the flash photographing mode is selected. If the flash photographing mode is selected, the process proceeds to step S5. If not, the process proceeds to step S20. It should be noted that the control unit 50 determines whether or not the flash photography mode is used, and when the control unit 50 determines whether or not the flash unit 54 is used, the photographer selects whether or not the flash unit 54 is used. If so, the selection result is used.

In step S5, the subject distance R detected by the distance measuring device 53 and the flash reach distance D calculated in step S2.
Compare with. If the subject distance R is greater than the flash reaching distance D, the process proceeds to step S6, and if not, the process proceeds to step S20. In step S6, the distance display unit 30
The flash reach distance D is displayed by the pointer 31 and the set value F of the diaphragm is displayed by the pointer 41 of the diaphragm display section 40. In a succeeding step S7, a timer incorporated in the control device 50 is activated to continuously display the flash reaching distance D and the aperture setting value F for a predetermined time. In the next step S8, the subject distance R is displayed by the pointer 31 of the distance display section 30, and the flash reachable aperture value E is displayed by the pointer 41 of the aperture display section 40.

In the next step S9, the half-push switch 5 is pressed.
8 is turned on, and if it is turned on, step S10
Otherwise, go to step S23. Step S1
At 0, it is determined whether or not the release switch 59 is on. If it is on, the process proceeds to step S22, and if not, the process proceeds to step S11. In step S11, a timer incorporated in the control device 50 is activated to continuously display the subject distance R and the flashable ultimate aperture value E for a predetermined time.

In a succeeding step S12, the subject distance R is displayed by the pointer 31 of the distance display section 30, and the aperture display section 4 is displayed.
The set value F of the aperture is displayed by the pointer 41 of 0. In step S13, a timer is activated to continue the subject distance R and the aperture set value F for a predetermined time. After this step S
Return to the processing of 6.

When steps S4 and S5 are denied, it is determined in step S20 whether the half-push switch 58 is on. When the half-push switch 58 is on, it is determined in step S21 whether the release switch 59 is on. When the release switch 59 is off, step S
Return to 20. When it is determined that the release switch 59 is on, the process proceeds to step S22, and the exposure device 60 is driven to perform the exposure process. In the following step S23, the distance display unit 3
The pointer of 0 is rotated to the character index “AF” position and the current AF
The fact that the mode is selected is displayed, and in the next step S24, the current aperture setting value F is displayed by the aperture display section 40, and the process is terminated. When it is determined in step S20 that the halfway press switch 20 is off, the process proceeds to step S23 without performing exposure.

In the above process, the flash photography mode is selected, the aperture setting value is F4, the subject distance R is 5 m, the flash arrival distance D is 3.5 m, and the flash reachable aperture value E is F2.
The display operation of the display device 8 in the case of 8 will be described with reference to FIG. 1 in association with FIGS. In step S1, the pointer 31 of the distance display unit 30 rotates to a position where the subject distance R = 5 m is displayed, as shown by the dotted line in FIG. After this, the flash photography mode is selected and R> D, and steps S4 and S5 are performed.
Is affirmed, and in step S6, the pointer 41 of the aperture display unit 40 displays the aperture set value F4 to the position (solid line position in FIG. 1) where the pointer 31 of the distance display unit 30 displays the flash reach distance D = 3.5 m. To each position (dotted line position in FIG. 1). If these displays are continued for a certain time in step S7, the pointer 31 of the distance display unit 30 is moved to the position (dotted line position in FIG. 1) where the subject distance R = 5 m is displayed in the aperture display unit 40 in step S8. The pointer 41 is rotated to the position (solid line position in FIG. 1) where the flash reachable aperture value F2.8 is displayed.

After that, if the release button 3 of the camera is held in a half-pressed state, the display of the subject distance R = 5 m and the flash reachable aperture value F2.8 is continued for a predetermined time in step S11. Then, in steps S12 and S13, as shown by the dotted line in FIG. 1, the pointer 31 of the distance display unit 30 is set to the position where the subject distance R = 5 m is displayed, and the pointer 41 of the aperture display unit 40 is set to the position where the aperture set value F4 is displayed. After each rotation, the flash reaching distance D = 3.5 m and the aperture setting value F4 are simultaneously displayed, and the subject distance R = 5 m and the flash reaching possible aperture value F2.8 are simultaneously displayed again by the processing from step S6. Repeated alternately.

As is apparent from the above, in the present embodiment, when the subject distance R exceeds the flash light reaching distance D and underexposure occurs, the flash light reaching distance D and the subject distance R are displayed on the distance display section 8 of the display unit 8. Since the aperture display section 40 alternately displays the aperture setting value F and the flash reachable aperture value E alternately, the subject distance R or the aperture setting value F required to obtain proper exposure is displayed. The amount of modification can be clearly known. Since the correction amount is analog-displayed by the hands 31 and 41, the correction amount can be intuitively grasped and a quick response can be made. As is clear from the processing of steps S6 and S8, the display of the flash reach distance D with respect to the aperture setting value F and the display of the aperture set value F are synchronized, and the display of the flash reachable aperture value E with respect to the subject distance R and the subject Since the display of the distance R is synchronized with the display of the distance R, the correspondence relationship between the correction amount of the distance and the correction amount of the aperture is clear, and there is little possibility of mistakenly correcting the distance and the aperture at the same time. Note that only one of the distance display section 30 and the aperture display section 40 may be switched as described above.

In the embodiment, any two kinds of the set value, the detected value and the calculated value when the flash device 54 is used are displayed alternately, but the present invention is not limited to such an example. For example, in the MF mode, the distance display unit 30 may alternately display the subject distance R detected by the distance measuring device 53 and the photographing distance set by the photographer.

If the camera allows the photographer to manually set both the aperture and the shutter speed, an appropriate aperture value and aperture set value corresponding to the set value of the shutter speed based on the photometry result of the object scene. It is possible to calculate an appropriate shutter speed corresponding to, and when the calculated value does not match the set value by the photographer, the set value and the calculated value may be displayed alternately. An example thereof is shown in FIG. In this example, the pointer 71 is set to the index 72.
In the shutter speed display 70 that rotates above to display the desired shutter speed, reciprocate the pointer 71 between the solid line position showing the set value 1/60 seconds and the dotted line position showing the calculated value 1/30 seconds. The photographer is informed of these differences.

In correspondence between the above embodiment and the claims,
The distance display section 30 and the display section 40 of the display unit 8 and the shutter speed display unit 70 constitute display means, the control device 50 constitutes display control means, the distance measuring device 53 constitutes a sensor, and the control device 50 constitutes arithmetic means. Further, the distance display unit 30 is defined by claim 4.
The distance display means and the diaphragm display section 40 constitute the diaphragm display means of claims 4 and 5, and the control device 50 constitutes the distance display control means, the diaphragm display control means and the display cycle control means. In addition,
The present invention is not limited to the pointer-type display device, but may be a device that allows the photographer to recognize the displayed information as an analog amount, such as a device that displays specific information in the form of a bar graph using the segmented liquid crystal segments. The type does not matter.

[0032]

As described above, according to the present invention, the set value input by the photographer, the detected value detected by the sensor, and the calculation means are calculated in relation to the specific information to be displayed by the display means. When any two of the three calculated values are present at the same time, these two values are alternately displayed in analog form on the display means. You can intuitively grasp the difference between them and quickly respond to correction of shooting conditions.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a display operation of a display according to an embodiment of the present invention.

FIG. 2 is a top view of a camera incorporating the display according to the embodiment.

FIG. 3 is an enlarged plan view of the display unit of FIG.

4 is a block diagram of a control system of the camera shown in FIG.

5 is a flowchart showing a part of display processing of a display device in the control device of FIG.

FIG. 6 is a flowchart following FIG. 5;

FIG. 7 is a diagram showing a modified example in which a shutter speed indicator is provided.

[Explanation of symbols]

 1 Camera Body 3 Release Button 8 Display 30 Distance Display 31 Pointer of Distance Display 32 Index of Distance Display 40 Aperture Display 41 Pointer of Aperture Display 42 Index of Aperture Display 50 Control Unit 70 Shutter Speed Indicator 71 Shutter speed display pointer 72 Index of shutter speed display

Claims (8)

[Claims] 1. A display unit capable of analog-displaying information related to a specific photographing condition of a camera, and a set value input by a photographer and a detected value detected by a sensor in relation to information to be displayed by the display unit. And display control means for alternately displaying these two values by the display means when any two of the three calculated values calculated by the calculating means are present at the same time. Camera display device. 2. The display device for a camera according to claim 1, wherein the display unit is configured to display distance information, and the display control unit includes an object distance detected by a sensor,
A display device for a camera, wherein the flash light reaching distance corresponding to the aperture value of the flash device calculated by the calculation means is displayed alternately by the display means. 3. The display device for a camera according to claim 1, wherein the display unit is configured to display aperture information, and the display control unit includes an aperture value set by a photographer and an arithmetic unit. A display device for a camera, wherein the calculated aperture value and an appropriate aperture value corresponding to a subject distance when the flash device is used are alternately displayed by the display means. 4. The display device for a camera according to claim 1, wherein the display means is provided with two types of distance display means for displaying distance information and aperture display means for displaying aperture information. The display control means includes a distance display control means for alternately displaying the subject distance detected by the sensor and the flash reach distance corresponding to the aperture value of the flash device calculated by the calculation means by the distance display control means, A iris display control means for alternately displaying the set iris value and an appropriate iris value corresponding to a subject distance when using the flash device calculated by the calculation means, and an iris display control means. Display device. 5. The display device for a camera according to claim 4, wherein the distance display means and the distance display means synchronize the display of the subject distance by the distance display means with the display of the proper aperture value by the aperture display means. A display device for a camera, comprising: display cycle control means for controlling a display switching cycle of the aperture display means. 6. The display device for a camera according to claim 1, wherein the display unit is configured to display distance information, and the display control unit detects a photographing distance set by a photographer and a sensor. A display device of a camera, wherein the object distance and the object distance are alternately displayed. 7. The display device for a camera according to claim 1, wherein the display unit is configured to display aperture information, and the display control unit includes an aperture value set by a photographer and an object scene. A display device for a camera, wherein the appropriate aperture value calculated by the calculation means on the basis of the photometric result is alternately displayed on the display means. 8. The display device for a camera according to claim 1, wherein the display unit is configured to display shutter speed information, and the display control unit sets a shutter speed set by a photographer and an object to be shot. A display device for a camera, wherein the display means alternately displays an appropriate shutter speed calculated by the calculation means based on the result of photometry of the field.